Mold.



. S. SWETZOFF.

MOLD.

APPLICATION FILED JULY 21.1916.

Patented Nov. 6, 1917.

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UNITED STATES PATENT OFFICE.

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casting jewelry and, more particularly, for

casting finger rings.

Heretofore, so far as I am familiar with the art of ring making, it has been quite common to make use of molds made of cuttlefish bone, a new mold being necessary for each casting, but my present improvement renders it possible and (1111128 practicable to make a large number of castings from a single mold.

My invention is fully illustrated in the annexed drawings, Figure 1 of said drawings being a side elevation of a mold, embodying my present improvements, as constructed for casting a ring having an integral pronged crown, and F ig. 2 is an edge view of the same. Figs. 3 and 1 are lnner face views of the two mold-sections adapted for casting a plain ring. In Fig. 5 I have shown end and circumferential views of the core used in producing such a ring.

Fig. 6 is a transverse, sectional, view of the mold section of Fig. 3, taken on the line 66 of said Fig. In Fig. 7 I have shown an inner face view of a mold section which is specially planned for casting a pronged ring, showing also, in proper relation to the said mold section, a removable mold section for the pronged crown, and Fig. 8 is an inner face view of said removable section.

Referring now to these drawings, the numerals 10 and 11 each indicate a mold-section of a mold proper for casting a plain ring, these sections being formed preferably of carbon, the confronting faces of the two sections being chambered in the customary manner, to provide a two-part mold con-v forming in shape to the shape of the ring which it is desired to cast and in the mold thus provided I locate a core 12 formed of carbon, preferably charcoal.

The mold and core thus provided, for the 1 production. of plain band rings,

are practically indestructible.

For use in casting Specification of Letters Patent. Application filed July 21, 1916.

Patented Nov. 6, 1917.

Serial No. 110,506.

pronged rings I provide a three-part mold,

that is to say, I utilize for the ring proper a two-part. mold like the one'just described excepting that the annular chamber cuts through the lower edge portion of said mold, and I then provide section 13 which is suitably chambered, as at 13 to provide a mold-for the casting of prongs integral with the ring proper and, because of the novel arrangement and operation of the complete mold, I am able to utilize cuttle-fish bone for the mold section -13 and to use the same repeatedly instead of being compelled to provide a new prong mold for each casting. The carbon mold sections 10 and 11 are vented as at 14 and 15 and they are also provided with the customary gate 17 for use in pouring the molten metal.

I will now describe a novel construction of frame-work by means of which the mold sections may be conveniently clamped and supported in proper relation to each other and, by means of which, the mold section 13 may be separated from the mold proper without destroying the delicate walls between the individual mold-sections.

Referring now to Figs. 1 and 2, the reference numerals 18 and 19 denote parallel rods located at opposite sides of the main carbon mold sections 10-11 and having inturned terminals 1819 which are located between said mold sections and the prong mold section 13, as is best seen in Fig. 1.

The other ends of the rods 1819 are fixedly joined by a plate 20; and slidably mounted upon the said rods is a similar plate 21 that is normally spaced apart from the plate 20 by means of spiral springs 22 and 23 mounted on the said rods between the two plates 20-21. The plate 21 is preferably formed with lateral extensions 21, 22 that are adapted to clasp the opposite sides of the carbon mold and thus prevent the accidental separation of the mold sections of said mold and I also provide a band 23 which surrounds the carbon mold, as well as the rods 18-19, and serves not only as a binder for the mold sections but also as a support and guide for the said rods.

he prong mold section 13 is held in proper relation to the carbon mold by dowel pins and also by a spiral spring 21 whose ends are detachably secured to pins 25 and 26 located in the opposite sides of the carbon mold; the said spring being passed an abutting mold 1 around the mold section 13, under tension, and thus serving to press mold section 13 into close engagement with thecarbon mold.

The carbon mold may be used, in the cast ing of plain rings, without the mold section 13 and without the described wire frame, in which event the two half sections of the carbon mold would be held against, separation by the binder 23 but, in casting pronged or signet rings, requiring the use of the mold section 13, I prefer to use the said wire frame in which case the pouring of the metal may be through a central opening in plate 21 which registers with: the gate in the carbon mold. After the metal has been run and cooled the spring, '24: is released when, by holding the carbon mold, and

. pressing down the plate 20, against the restraining force of the springs 22 and 23', the inturned ends 18 ---19 operate to force the mold section 13 straight away from the carbon mold, thus withdrawing the prongs of the casting fromthe small openings in mold section 13 without breaking, or otherwise injuring, the frail wall between the said openings.

The prong mold section 13 is thus left intact and free to be used again.

Having thus described my invention, I claim as new and Wish to secure by Letters Patentz In combination with primary mold sections,ameans for retaining said parts in operative relation to eachother, a supplemental prong-mold section yielding means for clamping said supplementalmold sectioninposition and means for forcing said supplemental mold section away from the primary mold sections.

SOLOMON SW'ETZOFF.

Copies of this patent may be obtained for five cents each, by. addressing the Commissioner of Patents, Washington, D. C. 

